Director Tang Yuh-Fong files initial Form 3 for CHIPMOS (NASDAQ: IMOS)

Rhea-AI Filing Summary

CHIPMOS TECHNOLOGIES INC director Tang Yuh-Fong filed an initial insider ownership report on Form 3. This filing establishes their status as a director and provides the baseline disclosure of any equity holdings associated with this role, without reporting any new stock purchases, sales, or option exercises.

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SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Tang Yuh-Fong

(Last) (First) (Middle)

C/O NO 1 R&D ROAD 1

HSINCHU SCIENCE PARK

(Street)

HSINCHU F5 300092

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
03/13/2026

3. Issuer Name and Ticker or Trading Symbol
CHIPMOS TECHNOLOGIES INC [ IMOS ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

Exhibit List: Exhibit 24 - Power of Attorney

No securities are beneficially owned.

	/s/ Hsiu-Ling Teng, attorney-in-fact	03/13/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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FAQ

What does Tang Yuh-Fong’s Form 3 filing for IMOS represent?

The Form 3 filing records Tang Yuh-Fong’s initial insider ownership status at CHIPMOS TECHNOLOGIES INC. It establishes a baseline disclosure of any equity holdings upon becoming a director, without indicating any recent insider buying, selling, or option exercises in IMOS shares.

Does the IMOS Form 3 show any insider buying or selling by Tang Yuh-Fong?

No, this Form 3 does not show any insider buying or selling. The transaction summary lists zero purchases, zero sales, and no derivative exercises, meaning the filing only serves as an initial ownership statement, not a record of recent trading activity.

What insider role does Tang Yuh-Fong report in the IMOS Form 3?

Tang Yuh-Fong reports serving as a director of CHIPMOS TECHNOLOGIES INC in the Form 3. The filing indicates director status but does not list any officer title or ten percent owner status, clarifying the specific insider capacity for future ownership and transaction reporting.

Are there any option or derivative positions disclosed for IMOS in this Form 3?

No option or derivative positions are disclosed in this Form 3. The derivative summary is empty and the transaction summary shows zero derivative transactions, exercises, or related entries, indicating no listed options, warrants, or similar instruments for Tang Yuh-Fong in this report.

Do the footnotes in the IMOS Form 3 change how ownership is attributed?

The Form 3 includes a footnotes section, but no substantive footnote text is provided in the available data. As a result, there is no additional information here about voting power, investment authority, or indirect ownership structures affecting how Tang Yuh-Fong’s holdings are attributed.